基于图像特征的纱线条干均匀度实时检测  

Real-time detection of yarn evenness based on image features

作　　者：宋栓军[1] 韩宇琪 方泽钰 SONG Shuanjun;HAN Yuqi;FANG Zeyu(School of Mechanical and Electrical Engineering,Xi’an Polytechnic University,Xi’an 710048,China)

机构地区：[1]西安工程大学机电工程学院,陕西西安710048

出　　处：《西安工程大学学报》2023年第4期32-39,共8页Journal of Xi’an Polytechnic University

基　　金：陕西省重点研发计划项目(2023-YBGY-349);西安市科技局先进制造技术攻关项目(21XJZZ0016)。

摘　　要：为能够及时地获取纺纱过程中纱线质量变化信息,为优化纱线工艺参数服务,提出一种实时检测纱线条干均匀度的测量方法。为提高测量效率,首先使用最小外接矩形对实时采集的连续纱线图像进行感兴趣区域(region of interest,ROI)获取,对获取纱线图像根据纱线方向进行自动裁剪。其次基于最大类间方差法(OTSU)阈值分割及形态学运算获得的纱线条干二值图像。最后利用尺度不变特征转换(scale-invariant feature transform,SIFT)算法检测特征点对重合部分数据去除,保证纱线数据的完整及连续性,提出加入纱线倾斜角计算纱线直径方法。基于此方法计算对3种线密度的紧密纺纯棉纱的纱线直径并对纱线条干及纱疵进行检测。实验测量直径平均误差为2.38%,变异系数(coefficient of variation,CV)值与Uster Classimat5条干测试仪测试结果基本一致,表明此方法可满足纱线运动速度为5~30 m/min的纱线条干均匀度实时检测。In order to obtain the yarn quality change information in the spinning process in time and optimize the yarn process parameters,a real-time measurement method for detecting the yarn evenness is proposed.In order to improve the measurement efficiency,firstly,the minimum bounding rectangle was used acquire the region of interest(ROI)of the real-time continuous yarn image,and automatically cut the acquired yarn image according to the yarn direction.Then the yarn evenness binary image was obtained based on OTSU threshold segmentation and morphological operation.Finally,the SIFT algorithm was used to detect feature points and remove overlapping data,ensuring the integrity and continuity of yarn data,proposing a method for calculating yarn diameter by adding yarn inclination angle.Based on this method,we calculated the yarn diameter of three types of linear density compact spun pure cotton yarn and detected yarn dryness and defects.The average error of the experimental measurement diameter is 2.38%.The CV value of the variation coefficient is basically consistent with the test results of the Uster Classimat5 yarn evenness tester,indicating that this method can meet the real-time detection of yarn evenness with a yarn motion speed of 5~30 m/min.

关 键 词：纱线直径 纱线条干均匀度 实时检测 最小外接矩形 形态学运算 尺度不变特征转换(SIFT)算法 

分 类 号：TS107.2[轻工技术与工程—纺织工程] TP391.4[轻工技术与工程—纺织科学与工程]